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A lack of it might be why sticking to diets or exercise routines feels so hard
This may indicate bacterial contamination or degradation byproducts triggering a local immune response
Vitamin B12 deficiency is one of the most common nutrient deficiencies in the world, especially for vegetarians, vegans and people with health conditions such as Crohns Disease or Celiac Disease which makes it hard to absorb nutrients
In vitro studies have characterised its binding interactions with nitric oxide-related signalling systems and its effects on extracellular matrix protein expression in cell culture models
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